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  41. A baseball outfielder throws a baseball of mass 0.15

Question :   41. A baseball outfielder throws a baseball of mass 0.15 : 2102107

 

41. A baseball outfielder throws a baseball of mass 0.15 kg at a speed of 40 m/s and initial angle of 30?. What is the kinetic energy of the baseball at the highest point of the trajectory? Ignore air friction.

A. zero

B. 30 J

C. 90 J

D. 120 J

42. A bobsled makes a run down an ice track starting at 150 m vertical distance up the hill. If there is no friction, what is the velocity at the bottom of the hill?

A. 27 m/s

B. 36 m/s

C. 45 m/s

D. 54 m/s

43. A 2 000-kg ore car rolls 50.0 m down a frictionless 10.0? incline. If there is a horizontal spring at the end of the incline, what spring constant is required to stop the ore car in a distance of 1.00 m?

A. 340 kN/m

B. 681 kN/m

C. 980 kN/m

D. 1 960 kN/m

44. An amount of work equal to 1.5 J is required to compress the spring in a spring-gun. What is the "launch speed" of a 15-g marble?

A. 14 m/s

B. 15 m/s

C. 18 m/s

D. 21 m/s

45. The SI units for k, the spring constant, are equivalent to:

A. J.

B. J / N.

C. kg / s2.

D. None of the above.

 

Solution
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Physics 1 Year Ago 85 Views
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